JP2015500405A - 紙および板紙の改善システムおよび方法 - Google Patents
紙および板紙の改善システムおよび方法 Download PDFInfo
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- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/06—Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals
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Abstract
Description
乱流発生装置は基本的には管群であり、ここで原料が加速され、繊維フロックが壊される。乱流発生装置の基本的機能は、繊維の横方向(CD)質量分布を一様にし、紙シートにおける繊維の一様なCD質量分布をもたらすことである。分散繊維がヘッドボックスにおいて管群を離れるときに、これは減衰乱流において凝集し始める。これは、分散中において、繊維を曲げる傾向にある粘性の動的力に繊維が曝されるという事実によって説明される。乱流が減衰すると、繊維がその元の形状を取り戻す傾向にある。単位体積当たりに多くの繊維があると、それは自由に歪みを取ることができない。代わりに、それは歪んだ姿勢に置かれるようになり、繊維ネットワーク(フロック)を構成する垂直の摩擦力によって連結されるであろう。乱流が高いほど、再凝集の傾向が強くなる。
a)i)アクリルアミド、および
ii)式I:
R1はHまたはCH3であり、
XはOまたはNHであり、
R2はカチオン性メチル基で置換されたC1〜C4アルキルである〕
を有する物質
の、対イオンとしてハロゲン化物を有する、直鎖状カチオン性または両性コポリマー;
b)アニオン性ポリアクリルアミド、非イオン性ポリアクリルアミドおよびポリエチレンオキシドの群から選択される少なくとも1つの水溶性成分;および
c)無機微粒子
を含む凝集系を用いて懸濁液を凝集させる方法であって、ここで、凝集系は水分散性または分岐状アニオン性有機ポリマーを含まないことを特徴とする、方法に関する。
実施例1:市販の歩留剤系を用いた試験
この実施例は、歩留および地合の間の関係性が、5つの大きく異なる市販の歩留剤系に対して特有であることを示す。初めの3つの系は、異なる分子量を有するカチオン性ポリアクリルアミド(C-PAM)であり、第4の系は、コロイドシリカゾルを組み合わせたC-PAMを含んでなる2成分系(Compozil)であった。第5の系は、C-PAMおよびナトリウムモンモリロナイトゾル(Hydrocol)を含んでなる別の2成分系であった。全ての系は、紙産業において広く用いられている。
原料濃度は5g/lであり、シートは60g/m2の坪量を有した。
この実施例において、種々の試験を行い、ここでは、第3の成分を2成分ポリマー系に添加し、歩留/地合の関係性への影響を調べた。
この3成分系は、以下に記載されるように、カチオン性ポリアクリルアミド(C-PAM)、高分子量アニオン性ポリマーおよびアニオン性モンモリロナイト粘土に基づいた。高分子量アニオン性ポリマーは、投与量および構造によって変えた。ポリマーの特性は表1に与えられる。
この目的は、歩留および地合への高分子量アニオン性ポリマーの効果を調べることであった。調べたアニオン性ポリマーを、0.4kg/tのカチオン性ポリアクリルアミド(C-PAM)および2.0kg/tのアニオン性モンモリロナイト粘土を含んでなる2成分微粒子系と合わせて添加した。アニオン性ポリマーの量の増加の効果およびアニオン性ポリマー構造の重要性を図4〜6に示す。
紙の地合への有利な効果とは対照的に、過剰なアニオン性ポリマーの添加は排水速度の減少をもたらした。
これらの根拠から、改善された地合の利点が利用されるはずであるならば、この系は良好な脱水能を有する系と共に使用されるべきであるということになる。微粒子系、例えばCompozil(シリカゾルと組み合わせたカチオン性ポリアクリルアミド/カチオン性デンプン)およびナトリウムモンモリロナイトと組み合わせたHydrocol(カチオン性ポリアクリルアミド/カチオン性デンプンデンプン)は、脱水の改善に関して、特別な利点を有する。
脱水を多量のアニオン性ポリマーの添加によって行うため、地合の改善は、化学的変化または脱水の変化の効果によってもたらされるかどうかを調査した(図7参照)。
この実施例は、繊維、アニオン性ポリアクリルアミドおよびNFCの異なる組み合わせが乱流をどのように減衰するかを示す。この実験は、管中において懸濁液をポンプ圧送し、セルロース繊維、アニオン性ポリアクリルアミドA-PAMおよびNFCの存在下において圧力降下を測定した場合に、パルプ懸濁液の圧力降下を調べることによって行われる。水をポンプ圧送する時の圧力降下はP0であり、種々の添加成分を有する繊維懸濁液をポンプ圧送する時の圧力降下はP1である。その場合、抵抗低減(DR)=(P0-P1)/P0と規定される。
抵抗低減が高いほど、乱流の減衰は高くなる。
Claims (13)
- セルロース系繊維懸濁液を形成し、懸濁液を凝集させ、装置において懸濁液を排水してシートを形成し、次にシートを乾燥することを含む、紙または板紙の製造方法であって、該懸濁液は、
a)i)アクリルアミド、および
ii)式I:
R1はHまたはCH3であり、
XはOまたはNHであり、
R2は、カチオン性メチル基で置換されたC1〜C4アルキルである〕
を有する物質
の、対イオンとしてハロゲン化物を有する、直鎖状カチオン性または両性コポリマー;
b)アニオン性ポリアクリルアミド、非イオン性ポリアクリルアミドおよびポリエチレンオキシドの群から選択される少なくとも1つの水溶性成分;および
c)無機微粒子
を含む地合改善3成分凝集系を用いて凝集され、
ここで、凝集系が水分散性または分岐状アニオン性有機ポリマーを含まないことを特徴とする、方法。 - 式Iを有する物質は、N,N,N-トリメチル-2-アミノエチルアクリレート、N,N,N-トリメチル-2-アミノエチルメタクリルアミドまたは3-アクリルアミド-3-メチル-ブチル-トリメチル-アンモニウムクロリドから選択される、請求項1に記載の方法。
- 直鎖状カチオン性または両性コポリマーは、106ダルトンより高い、好ましくは2×106ダルトンより高い、例えば4×106ダルトンより高い分子量を有する、請求項1および2のいずれかに記載の方法。
- 直鎖状カチオン性または両性コポリマーは、1〜100モル%、適当には1〜80モル%、好ましくは1〜60モル%の範囲のカチオン性を有する、請求項1〜3のいずれかに記載の方法。
- 非イオン性ポリアクリルアミドは実質的に直鎖状である、請求項1〜4のいずれかに記載の方法。
- アニオン性および/または非イオン性ポリアクリルアミドは、15%以下、例えば10%以下架橋される、請求項1〜4のいずれかに記載の方法。
- アニオン性および/または非イオン性ポリアクリルアミドは、106ダルトンより高い、好ましくは2×106ダルトンより高い、例えば4×106ダルトンより高い分子量を有する、請求項1〜6のいずれかに記載の方法。
- アニオン性および/または非イオン性ポリアクリルアミドは、0〜100モル%、適当には80モル%未満、好ましくは0〜60%モル%のアニオン性基のイオン性を有する、請求項1〜7のいずれかに記載の方法。
- 無機微粒子は、シリカ系材料から、例えばモンモリロナイト粘土およびコロイドシリカから、好ましくはアニオン性シリカおよびNaモンモリロナイトから選択される、請求項1〜8のいずれかに記載の方法。
- 凝集系は、微小繊維セルロースおよび/またはナノフィブリル化セルロースをさらに含む、請求項1〜9のいずれかに記載の方法。
- ナノフィブリル化セルロースをさらに含む、請求項12に記載の紙および板紙。
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JP2021507130A (ja) * | 2017-12-19 | 2021-02-22 | ストラ エンソ オーワイジェイ | ミクロフィブリル化セルロースを含む繊維製品の製造方法 |
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CA3001674C (en) * | 2015-10-12 | 2022-10-04 | Solenis Technologies, L.P. | Method of increasing drainage performance of a pulp slurry during manufacture of paper products, and products therefrom |
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CN104114766B (zh) | 2016-06-01 |
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BR112014014398A2 (pt) | 2017-06-13 |
WO2013089638A1 (en) | 2013-06-20 |
CA2858028A1 (en) | 2013-06-20 |
JP6307439B2 (ja) | 2018-04-04 |
US20140345817A1 (en) | 2014-11-27 |
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